Current BIOS designs can log the latest post code in the ECMOS for a developer to track the
latest system fail and can also log through WMI to track the system fail in the OS environment.
However, this still requires that the failed unit can still complete a successful boot up after
the fail. Sometimes, if the machine cannot recover after the fail, meaning it cannot complete
the boot sequence (boot to OS, Storage, Shell, DOS…etc.), it will become a dead board.
Therefore, the services team will never know what the latest fail post code is and might not
able to further investigate the fail point.
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INC, HP, "PRE-OS REMOTE ANALYSIS ON BROKEN SYSTEM", Technical Disclosure Commons, (November 17, 2019)